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EP-2017-052

(Submitted on 27 Apr 2017)

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Abstract

Decays of $B^0$ and $B_{s}^0$ mesons to the charmless baryonic final states
$p \overline{p} h^+ h^{\prime-}$, where $h$ and $h^\prime$ each denote a kaon
or a pion, are searched for using the LHCb detector. The analysis is based on a
sample of proton-proton collision data collected at center-of-mass energies of
$7$ and $8\,$TeV, corresponding to an integrated luminosity of $3\,$fb$^{-1}$.
Four-body charmless baryonic $B_{s}^0$ decays are observed for the first time.
The decays $B^0_{s}\to p \overline{p} K^+ K^-$, $B^0_{s}\to p \overline{p}
K^\pm \pi^\mp$, $B^0\to p \overline{p} K^\pm \pi^\mp$ and
$B^0\to p \overline{p} \pi^+\pi^-$ are observed with a significance greater
than $5$ standard deviations; evidence at $4.1$ standard deviations is found
for the $B^0\to p \overline{p} K^+ K^-$ decay and an upper limit is set on the
branching fraction for $B^0_{s}\to p \overline{p} \pi^+ \pi^-$. Branching
fractions in the kinematic region $m(p \overline{p})<2850\,$MeV$/c^2$ are
measured relative to the $B^0 \to J/\psi (\to p \overline{p}) K^*(892)^0$
channel.

Tables and captions

Fitted yields, signal yield significances and branching fractions computed using
Eq. (1). The uncertainties on the yields are
statistical only.
The first uncertainty on each branching fraction is statistical, the second systematic, the third
comes from the uncertainty on the branching fraction of the
normalization mode and the fourth, where present, is due to the
uncertainty on $f_d/f_s$.

Ratios of branching fractions among different $ B ^0_{{\scriptscriptstyle (}s {\scriptscriptstyle )}} \!\rightarrow p \overline p h
h^{\prime} $ modes. The
first uncertainty is statistical, the second systematic and the third, where present, comes from the
uncertainty on $f_d/f_s$.

This ZIP file contains supplemetary material for the publication
LHCb-PAPER-2017-005. The files are:
Supplementary.pdf : An overview of the extra figures and tables
Sup*.pdf, Sup*.png, Sup*.eps, Sup*.C : The figures in various formats
TabSup*.pdf, TabSup*.tex : The tables in various formats